taler-android

Android apps for GNU Taler (wallet, PoS, cashier)
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TalerUri.kt (2355B)

      1 /*
      2  * This file is part of GNU Taler
      3  * (C) 2020 Taler Systems S.A.
      4  *
      5  * GNU Taler is free software; you can redistribute it and/or modify it under the
      6  * terms of the GNU General Public License as published by the Free Software
      7  * Foundation; either version 3, or (at your option) any later version.
      8  *
      9  * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
     10  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
     11  * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
     12  *
     13  * You should have received a copy of the GNU General Public License along with
     14  * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
     15  */
     16 
     17 package net.taler.common
     18 
     19 import java.util.Locale
     20 
     21 public object TalerUri {
     22 
     23     private const val SCHEME = "taler://"
     24     private const val SCHEME_INSECURE = "taler+http://"
     25     private const val AUTHORITY_PAY = "pay"
     26     private const val AUTHORITY_WITHDRAW = "withdraw"
     27     private const val AUTHORITY_REFUND = "refund"
     28     private const val AUTHORITY_TIP = "tip"
     29 
     30     public data class WithdrawUriResult(
     31         val bankIntegrationApiBaseUrl: String,
     32         val withdrawalOperationId: String
     33     )
     34 
     35     /**
     36      * Parses a withdraw URI and returns a bank status URL or null if the URI was invalid.
     37      */
     38     public fun parseWithdrawUri(uri: String): WithdrawUriResult? {
     39         val (resultScheme, prefix) = when {
     40             uri.startsWith(SCHEME, ignoreCase = true) -> {
     41                 Pair("https://", "${SCHEME}${AUTHORITY_WITHDRAW}/")
     42             }
     43             uri.startsWith(SCHEME_INSECURE, ignoreCase = true) -> {
     44                 Pair("http://", "${SCHEME_INSECURE}${AUTHORITY_WITHDRAW}/")
     45             }
     46             else -> return null
     47         }
     48         if (!uri.startsWith(prefix, ignoreCase = true)) return null
     49         val parts = uri.let {
     50             (if (it.endsWith("/")) it.dropLast(1) else it).substring(prefix.length).split('/')
     51         }
     52         if (parts.size < 2) return null
     53         val host = parts[0].lowercase(Locale.ROOT)
     54         val pathSegments = parts.slice(1 until parts.size - 1).joinToString("/")
     55         val withdrawId = parts.last()
     56         if (withdrawId.isBlank()) return null
     57         val url = "${resultScheme}${host}/${pathSegments}"
     58 
     59         return WithdrawUriResult(url, withdrawId)
     60     }
     61 
     62 }